Becareful.....You can lose a name very easily
I've had this happen to me a couple times before I found out what was going on. I would type in a name to check to see if it was avail., if I didn't buy it right then it could become listed as part of similar domains that other people are looking for. I've found a couple names this way. I've had names in my Shopping Cart and for some reason could buy them at that time. I had to empty my Shopping Cart and start over. I typed the names back into the search and found that they had been purchased. This happened at Godaddy. I don't think it was their fault, but something weird was going on. When I did a Whois search or the person who reg'd the name within seconds of me empting my cart, it was the Registrar for all the .WS domains. I think if you look for a name at certain registrars and don't buy it, then there is a way that they can "TASTE" the domain to see if others are looking for it. It turned out that after a couple days the domains that I lost ended up in my account. I don't know what's going on out there but be very careful where you search for names. I really don't like Network Solutions, but I use them to do my searches. I haven't had anything weird happen yet by doing searches with them, but you never know.